Danfoss VLT AQUA Drive FC 200 Programming Manual page 139

Parameter Description
20-73 Minimum Feedback Level
Range:
-999999 [ -999999.999 -
ProcessCtrlUnit par. 20-74
*
ProcessCtrlUnit]
20-74 Maximum Feedback Level
Range:
999999 [ par. 20-73 -
ProcessCtrlUnit 999999.999
*
ProcessCtrlUnit]
20-79 PID Autotuning
Option: Function:
This parameter starts the PID auto-tuning
sequence. Once the auto-tuning has successfully
completed and the settings have been accepted or
rejected by the user, by pressing [OK] or [Cancel]
at the end of tuning, this parameter is reset to [0]
Disabled.
[0] Disabled
[1] Enabled
3.17.5 20-8* PID Basic Settings
This parameter group is used to configure the basic
operation of the adjustable frequency drive's PID
controller, including how it responds to a feedback that is
above or below the setpoint, the speed at which it first
starts functioning, and when it will indicate that the
system has reached the setpoint.
20-81 PID Normal/ Inverse Control
Option: Function:
[0] Normal [0] Normal causes the adjustable frequency drive's
output frequency to decrease when the feedback is
greater than the setpoint reference. This is common
®
VLT AQUA Drive Programming Guide
Function:
The minimum allowable
feedback level should be
entered here in user units
as defined in
20-12 Reference/Feedback
Unit. If the level falls below
20-73 Minimum Feedback
Level, auto-tuning is
aborted and an error
message appears in the
LCP.
Function:
The maximum allowable
feedback level should be
entered here in user units
as defined in
20-12 Reference/Feedback
Unit. If the level rises
above 20-74 Maximum
Feedback Level, auto-tuning
is aborted and an error
message appears in the
LCP.
®
MG20O622 - VLT is a registered Danfoss trademark
20-81 PID Normal/ Inverse Control
Option: Function:
for pressure-controlled supply fan and pump
applications.
[1] Inverse [1] Inverse causes the adjustable frequency drive's
output frequency to increase when the feedback is
greater than the setpoint reference.
20-82 PID Start Speed [RPM]
Range: Function:
Size [ 0 - When the adjustable frequency drive is first
related par. started, it initially ramps up to this output
*
4-13 speed in open-loop mode, following the
RPM] active ramp-up time. When the output
speed programmed here is reached, the
adjustable frequency drive will automat-
ically switch to closed-loop mode and the
PID controller will begin to function. This is
useful in applications in which the driven
load must first quickly accelerate to a
minimum speed when it is started.
NOTICE!
This parameter will only be visible if
0-02 Motor Speed Unit is set to [0] RPM.
20-83 PID Start Speed [Hz]
Range: Function:
Size [ 0 - When the adjustable frequency drive is first
related par. started, it initially ramps up to this output
*
4-14 frequency in open-loop mode, following the
Hz] active ramp-up time. When the output
frequency programmed here is reached, the
adjustable frequency drive will automatically
switch to closed-loop mode and the PID
controller will begin to function. This is
useful in applications in which the driven
load must first quickly accelerate to a
minimum speed when it is started.
NOTICE!
This parameter will only be visible if
0-02 Motor Speed Unit is set to [1] Hz.
20-84 On Reference Bandwidth
Range:
5 % [0 - 200 %]
*
3
Function:
3-113
3